spitz vs Pomeranian

spitz and Pomeranian both are nouns.

Word	Noun	Adjective	Verb	Adverb
spitz	Yes	No	No	No
Pomeranian	Yes	No	No	No

As nouns, Pomeranian is a hyponym of spitz; that is, Pomeranian is a word with a more specific, narrower meaning than spitz:

spitz: any of various stocky heavy-coated breeds of dogs native to northern regions having pointed muzzles and erect ears with a curled furry tail
Pomeranian: breed of very small compact long-haired dogs of the spitz type

Other hyponyms of spitz include Samoyed, Samoyede, chow, chow chow, keeshond.

spitz (noun)	Pomeranian (noun)
any of various stocky heavy-coated breeds of dogs native to northern regions having pointed muzzles and erect ears with a curled furry tail	breed of very small compact long-haired dogs of the spitz type